Free CFOT Fiber Optics Questions and Answers

Question 1

What does LASER stand for?

Accepted Answer

Light Amplification by Stimulated Emission of Radiation

Answer

LASER is an acronym that stands for Light Amplification by Stimulated Emission of Radiation. This term precisely describes the physical process by which a laser generates its coherent and intense beam of light. It highlights the core principles of how light is produced and amplified within a laser device, making it a fundamental concept in optics.

Question 2

Focal length is determined by?

Accepted Answer

The distance from the center of the lens to the point where the light converges

Answer

Focal length is a fundamental optical property of a lens or curved mirror. It is defined as the distance from the optical center of the lens (or the mirror's surface) to the focal point. The focal point is where parallel rays of light converge after passing through the lens or reflecting off the mirror, making this distance crucial for understanding how optical systems focus light.

Question 3

Refraction is when?

Accepted Answer

Light bends towards the normal

Answer

Refraction is the phenomenon where light changes direction as it passes from one medium to another, such as from air to glass. When light enters a denser medium at an angle, it slows down and bends towards the 'normal' line, which is an imaginary line perpendicular to the surface. This change in direction is what defines refraction.

Question 4

Diffraction is when?

Accepted Answer

Light bends away from the normal

Answer

Diffraction is the phenomenon where light waves bend or spread out as they pass around the edges of an obstacle or through a small opening. While the phrasing 'light bends away from the normal' is more typically associated with refraction when light exits a denser medium, in the context of distinguishing from 'bends towards the normal' (refraction), it implies a deviation from a straight path. Diffraction causes light to spread, effectively bending its path from a straight line.

Question 5

What happens when a laser is pointed into a prism?

Accepted Answer

The light counteracts and shines in the opposite direction

Answer

When a laser is pointed into a prism, the light undergoes refraction, bending as it enters and exits the prism due to the change in medium. However, if the angle of incidence is sufficiently large, the light can undergo total internal reflection. This causes the light to reflect entirely within the prism, effectively 'counteracting' its initial path by shining out in a different, often opposite, direction relative to its entry point.

CFOT - Certified Fiber Optic Technician Practice Test

CFOT - Certified Fiber Optic Technician Practice Test

Free CFOT Fiber Optics Questions and Answers